I am most surprised about the short supply of elders. I guess this is one reason why they started allowing single borthers to serve.
As far as I know being married was never a WTS requirement for elders. Sounds like you were never a jw but belonged to a religion that does restrict single men. What is noteworthy, at least in my area, they have appointed an alcoholic and wife abuser as well as other men they never would have in the past.
In the almost 50 years I was in the WTS, many single men were appointed elders, as well as circuit and district overseers and students of the Ministerial Training School (which does require singleness).
As far as there being a lot of pedophiles at the book studies, it is just as likely that molesting will take place apart from the KH or book studies, whereas connections with children can be made at either.
Based on my experience with the elders searching for private homes (jws either did not want to "volunteer" becase people destroyed property, stole things, or it invaded their home time twice a week, or the ones that volunteered with not "in good standing".
So now instead of 4 or 5 elders (or more) having to prepare (ha) and conduct a book study each week, only one, and instead of trying to find a "qualified reader" for each, only one.